Devices for detection of antibodies against therapeutic drugs (ADAs), in which chimeric proteins facilitate immobilization and exposure of target epitopes, are described. Results can be obtained in minutes, enabling point of care testing and/or patient self-testing, and risk assessment. The data can also be used for deriving scientific knowledge in the fields of oncology, autoimmune diseases (including but not restricted to diabetes, multiple sclerosis and rheumatoid arthritis), cardiovascular diseases, rare diseases, and other diseases for which treatment comprises administration of a therapeutic drug and/or gene therapy.